Microphone Audio RF Noise Cancellation in Mobile Uplinks
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Solution Overview
Problem
Mobile communication devices experience distorted audio signals due to interference from radio frequency (RF) noise, which is not effectively addressed by existing technologies.
Innovation Solution
A system and method that utilize processing logic to generate a device-specific noise waveform by adjusting a generic noise waveform based on power level and transmission timing information, and then subtract this waveform from the audio signal to remove RF noise, resulting in improved sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF signals are transmitted by the mobile device, then communication functionality is achieved, but audio signals captured by the microphone become distorted with noise
Solution Approach 1:
The patent applies noise cancellation technology that uses the harmful RF noise signal itself as a reference to generate an anti-noise signal. The processing logic captures the RF noise characteristics during transmission and creates a cancellation waveform that is subtracted from the audio signal, converting the harmful noise into a useful reference for removal.
Solution Approach 2:
The patent introduces an intermediary processing logic layer between the microphone and the transmission logic. This processing logic captures audio signals, generates noise waveforms based on RF characteristics, and produces cleaned audio signals for transmission, thereby mediating the interference between RF transmission and audio capture.
2Measurement precision
If noise cancellation processing is applied to remove RF noise, then audio signal quality is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by capturing RF noise characteristics during transmission periods and pre-generating noise waveforms before the actual audio transmission. This allows the complex noise cancellation processing to be prepared in advance, reducing the computational burden during real-time audio transmission.
Solution Approach 2:
The processing logic uses the device's own RF transmission characteristics to generate the noise cancellation signals. The system self-services by using its transmission logic's power level information and timing information to create the anti-noise waveforms, eliminating the need for external noise reference signals or additional complex hardware.
Data Source
AI summary
A system comprising audio logic adapted to convert captured sound into an audio signal. The system also comprises transmission logic which causes noise to be added to the audio signal. The system further comprises processing logic adapted to at least partially remove the noise from the audio signal by subtracting a noise waveform from the audio signal to produce a result signal. The processing logic generates the noise waveform using power level information associated with the transmission logic. The transmission logic transmits the result signal to another electronic device.